Who I have the same questioned this topic

I recently received this notice --- VZW Free Msg: NOTICE - Action required By October 1, 2021. Verizon has detected that you have an older Windows Message+ app on one or more devices that will need to be upgraded. You may no longer have access through your Windows Message+ application after October 1, 2021 and will be required to upgrade to continue using the app. Please click to access the latest version of Message+: https://www.microsoft.com/en-us/p/verizonmessages/9plsfg6pjz50#activetab=pivot:overviewtab

I clicked the link and followed through with the download onto my laptop and desktop.  When finished (either computer), I clicked the "launch" button and got this message:

Message+
 "Start messaging." When I click that, the next window asks for my Device Name and Verizon Wireless number and says "To make sure we have the right number, we'll send a text message to your phone. After entering those and hitting the "submit" button, it sends the code. After entering the code and hitting the "verify" button, a get one of 2 screens :

ERROR!
You have an incompatible version of Message+ on your primary device. Please upgrade your primary device with the latest version of Message+, then try again.

I have the latest version of Message+ on my Iphone from the app store.  The version number is 5.1.0 and is the only version available on the Apple app store.  I have tried deleting and the reinstalling the app, but I still get the same error.

ERROR!
Invalid Pin (I entered the pin sent by VZ as soon as I received it.

What do I need to do install Message+ on my laptop and desktop, both of which run Windows10?